#include <iostream>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

int main()
{
    printf("hello, printf\n");
    fprintf(stdout, "hello, fprintf\n");
    
    const char* s = "hello, fwrite\n";
    fwrite(s, strlen(s), 1, stdout);
    
    const char* s1 = "hello, write\n";
    int i = write(1, s1, strlen(s1));    
    
    return 0;
}

